Subaru Legacy 2005 Service Manual page 3104

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTICS)
Step
1 CHECK GROUND CIRCUIT OF ABSCM&H/U.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ABSCM&H/
U.
3) Measure the resistance between
ABSCM&H/U connector and chassis ground.
Connector & terminal
(B301) No. 15 — Chassis ground:
2 CHECK POOR CONTACT IN CONNECTOR. Is there poor contact in con-
3 CHECK SOURCES OF SIGNAL NOISE.
4 CHECK SOURCES OF SIGNAL NOISE.
5 CHECK ABSCM&H/U.
1) Connect all the connectors.
2) Perform clear memory mode.
3) Perform the inspection mode.
4) Read the DTC.
6 CHECK ANY OTHER DTC ON DISPLAY.
S: DTC C0109 POWER VOLTAGE MALFUNCTION
DTC DETECTING CONDITION:
Power voltage of the ABSCM&H/U is too low or too high.
TROUBLE SYMPTOM:
• ABS does not operate.
• EBD may not operate.
NOTE:
If EBD does not operate, brake warning light comes on as well as ABS warning light. Both warning lights go
off if voltage returns.
Check
Is the resistance less than 0.5
Ω?
nectors between battery, igni-
tion switch and ABSCM&H/U?
Are the radio wave devices and
electric components installed
correctly?
Are noise sources (such as an
antenna) installed near the
sensor harness?
Is the same DTC displayed?
Is any other DTC displayed?
ABS(diag)-60
Yes
Go to step 2. Repair the
ABSCM&H/U
ground harness.
Repair the con- Go to step 3.
nector.
Go to step 4. Install the radio
wave device and
electric compo-
nents properly.
Install the noise Go to step 5.
sources apart from
the sensor har-
ness.
Replace the Go to step 6.
ABSCM only.
<Ref. to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Inspect the DTC Temporary poor
using "List of Diag- contact occurs.
nostic Trouble
Code (DTC)".
<Ref. to
ABS(diag)-38, List
of Diagnostic Trou-
ble Code (DTC).>
No